Nvidia-prime after enable PRIME Synchronization non-existent VGA device will show up in the output of xrandr and in Display manager

[Vladimir]

Systems with Optimus (Intel+NVIDIA GPUs) can have ghost VGA devices hardcoded in the BIOS. This leads the system into thinking that there is actually one more active output than there really is.

1) Ubuntu 16.04.3 LTS
2) nvidia-prime 0.8.2
3) When i enable PRIME Synchronization by set option options nvidia_390_drm modeset from '0' to '1' in /etc/modprobe.d/nvidia-graphics-drivers.conf and add option to grub nvidia-drm.modeset=1 and after reboot there only one active output in xrandr --verbose is LVDS.

4) When i enable PRIME Synchronization by set option options nvidia_390_drm modeset from '0' to '1' in /etc/modprobe.d/nvidia-graphics-drivers.conf and add option to grub nvidia-drm.modeset=1 and after reboot and here you go in xrandr --verbose there non-existent display detected VGA-0 (Ghost screen with wrong resolution 1360x768).

 it's same bug as here https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1296020 but on LTS version of ubuntu

[Vladimir (volnes88)]

And here my gpu-manager.log

[Vladimir (volnes88)]

And lspci

[Vladimir (volnes88)]

Xorg.0.log too

[Vladimir (volnes88)]

and in kern.log there always:

Feb 15 21:13:09 volnes-TWH kernel: [ 1284.817144] nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device VGA-0
Feb 15 21:13:20 volnes-TWH kernel: [ 1295.056345] nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device VGA-0

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.